US20090289994A1 - Maintainable coplanar front face for silicon die array printhead - Google Patents
Maintainable coplanar front face for silicon die array printhead Download PDFInfo
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- US20090289994A1 US20090289994A1 US12/536,196 US53619609A US2009289994A1 US 20090289994 A1 US20090289994 A1 US 20090289994A1 US 53619609 A US53619609 A US 53619609A US 2009289994 A1 US2009289994 A1 US 2009289994A1
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- printhead
- array
- die
- substrate
- fill material
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 13
- 229910052710 silicon Inorganic materials 0.000 title claims description 13
- 239000010703 silicon Substances 0.000 title claims description 13
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000000758 substrate Substances 0.000 claims abstract description 24
- 239000012530 fluid Substances 0.000 claims description 21
- 239000012778 molding material Substances 0.000 claims description 19
- 238000000465 moulding Methods 0.000 claims description 19
- 150000001875 compounds Chemical class 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- 238000012423 maintenance Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000003491 array Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000008393 encapsulating agent Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 239000002210 silicon-based material Substances 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/145—Arrangement thereof
- B41J2/155—Arrangement thereof for line printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/19—Assembling head units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/20—Modules
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49346—Rocket or jet device making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49885—Assembling or joining with coating before or during assembling
Definitions
- a typical printhead array can include a plurality of subunits known as a die module or chip.
- Each die module can comprise hundreds or thousands of fluid emitters.
- An exemplary full-width thermal fluid jet fluid ejecting head has one or more die modules forming a full-width array extending across the fill width of the receiving medium on which the image is to be printed.
- each die module includes its own ink supply manifold, or multiple die modules can share a common ink supply manifold.
- each die module can be very sharp at the cut edges. This problem is compounded by the spacing of the individual modules in an array on a printhead unit because of the need to maintain the nozzles during use. Wiping across sharp cut edges of the individual die modules within an array can damage the wiper blades. Accordingly, current designs for die module arrays are limited in order to avoid having a wiper structure traverse the sharp edges of the die modules within the array or alone.
- a method of forming a subassembly for a full width array printhead is provided.
- the exemplary method can include providing a substrate, mounting an array of die modules on a surface of the substrate with an active face of each die module exposed, and supplying a curable fill material laterally contiguous with the array of die modules to define a continuous printhead surface coplanar with the active face of the array of die modules.
- a subassembly for a full width array printhead is provided.
- the exemplary subassembly can include a substrate; an array of die modules formed on a surface of the substrate, each die module comprising an active fluid emitting surface; and a fill material surrounding the array of die modules and coplanar with the active surfaces.
- a printhead subassembly for an ink jet printer is provided.
- the exemplary subassembly can include at least one silicon die module laterally contiguous with a cured molding material, the silicon die module and cured molding material defining a continuous exposed surface.
- FIG. 1 depicts a perspective view of an exemplary ink jet printhead incorporating a completed subassembly in accordance with embodiments of the present teachings
- FIG. 2 is a perspective view of a die module subassembly of a printhead subassembly in accordance with embodiments of the present teachings
- FIG. 3 is a perspective view of a printhead subassembly at a further stage of assembly with respect to FIG. 2 and in accordance with embodiments of the present teachings;
- FIG. 4 is a side view illustrating an exemplary molding fixture in accordance with embodiments of the present teachings.
- FIG. 5 is a flow chart depicting a method in accordance with exemplary embodiments of the present teachings.
- Embodiments pertain generally to ink jet printheads, and more particularly to the die module array subassembly thereof. Although the embodiments are described in connection with structures for “fluid”, it will be appreciated that the fluid can be ink, biologic fluid, industrial fluid, or chemical fluid, by way of non-limiting examples.
- a silicon member having a plurality of ink channels is known as a “die module” or “chip”.
- Each die module can comprise hundreds, thousands, or more of the fluid emitters, spaced 100, 180, 200 or 300 or more to the inch.
- An exemplary full-width thermal fluid jet fluid ejecting head has one or more die modules forming a full-width array extending across the full width of the receiving medium on which the image is to be printed.
- each die module can includes its own ink supply manifold, or multiple die modules can share a common ink supply manifold.
- FIG. 1 illustrates a full width array type printhead 100 according to an exemplary embodiment herein.
- a full width array printhead will be understood herein to include an array of ejectors and extends the full width of a print sheet. Such a printhead can also encompass a large partial width array printhead.
- the printhead 100 can include the subassembly 300 of FIG. 3 , an ink supply 110 connected to the subassembly, and a wiper assembly 120 opposing an active surface of the subassembly 300 .
- Passageways can be provided to connect the ink supply 110 , such as a reservoir, to nozzle outlets (not shown) in the active fluid emitting surface of die modules in the printhead.
- the fluid emitting surface is known in the art to include a plurality of nozzle openings, which are omitted from the figures herein for purposes of simplification. Numbers and patterns of nozzle openings can vary widely and their detail does not form a part of the invention.
- the wiper assembly 120 can be used to clear debris from the active fluid emitting surface of the subassembly 300 .
- the wiper assembly 120 can include flexible rubber or polymer blades, and the specific structure thereof can vary according to design parameters.
- the substrate 210 can be a simple circuit board material such as a high Tg FR4 ranging up to a Low Temperature Co-fired Ceramic (LTCC) substrate.
- LTCC Low Temperature Co-fired Ceramic
- An injection member 490 such as an injection needle, can pass through one or more ports 492 of the substrate 410 .
- the injection member 490 can be positioned to inject molding material 450 under pressure into a cavity 455 or interstices defined by the remaining space surrounding the die modules 420 and between the planar engaging surface 465 and the planar upper surface 415 of the substrate 410 .
- Excess molding material 450 can be evacuated from the interstices 455 by suitable exhaust ports 495 . In addition, other excess material can be trimmed away after the molding process.
- a method 500 for forming the subassembly 300 of FIG. 3 and using the device of FIG. 4 can include those steps described in FIG. 5 . It will be appreciated that while certain steps are shown, other steps may be added or existing steps can be removed or modified without departing from the scope of the invention.
- An optional step 530 can be included for applying a sacrificial film 480 to one or both of the die modules 420 and the engaging surface 465 of the molding component 460 .
- Use of the sacrificial film 480 can enhance protection of the parts during molding and final processing.
- the molding component 460 is positioned such that the engaging surface 465 thereof is in continuous surface contact with the active surfaces 425 of all of the module components 420 .
- the curable molding material 450 is injected into the open regions 455 surrounding the die modules 420 and between the planar upper surface 415 of the substrate 410 and planar engaging surface 465 of the molding component 460 .
- the molding material 450 can be cured in situ prior to removal of the molding component 460 from the subassembly at 570 .
- the molding material can be cured at 580 subsequent to removal of the molding component from the subassembly at 570 .
- certain materials can be partially cured at 560 prior to removal of the molding component 460 after which a final cure can take place at 580 . If the subassembly is removed from the molding component 460 for curing, it can be cured in batches along with similar subassemblies.
- any excess molding material 450 can be trimmed from the subassembly at step 590 as desired.
- the molding material 450 can be an encapsulant, such as an underfill encapsulant.
- a variety of known molding materials suitable for use in the exemplary embodiments include those which are epoxy based and rapidly cured to enable efficient duration of manufacturing cycles. Compound formulations can vary and are driven by enormous worldwide volume and are responsive to environmental concerns. In any event, the molding material can be selected to complement the coefficient of thermal expansion (CTE) of the substrate used.
- the molding material used can be of a composition, such as glass filled epoxies, which will not shrink or separate from the silicon material of the die modules, and have a similar CTE as the die modules.
- Non-limiting examples include those materials available in the 3-20 ppm/degree C. range, which are also compatible with substrate and wirebond materials. This value can be adjusted by altering the filler silica content as known in the art.
- the molding material can be a low viscosity material.
- the low viscosity material can be poured or otherwise supplied to the molding component 460 such that the molding material flows to surround into the desired fill volume. Subsequent curing of the low viscosity molding material will render a suitable hardness to the fill material and provide the same results as injection molded material.
Abstract
Description
- This application is a divisional application of U.S. patent application Ser. No. 11/837,728 filed on Aug. 13, 2007, the disclosure of which is incorporated herein by reference in its entirety.
- THE PRESENT invention generally relates to an ink jet printhead, and more particularly, a coplanar surface of a silicon die array printhead.
- In the fabrication of ink jet devices, printhead arrays can be used to increase print speed.
- A typical printhead array can include a plurality of subunits known as a die module or chip. Each die module can comprise hundreds or thousands of fluid emitters. An exemplary full-width thermal fluid jet fluid ejecting head has one or more die modules forming a full-width array extending across the fill width of the receiving medium on which the image is to be printed. In these fluid ejecting heads with multiple die modules, each die module includes its own ink supply manifold, or multiple die modules can share a common ink supply manifold.
- It is known that high quality nozzles can be formed in a silicon die module, making silicon a preferred material for this purpose. However, when the separate die modules are cut from a single silicon slab, each die module can be very sharp at the cut edges. This problem is compounded by the spacing of the individual modules in an array on a printhead unit because of the need to maintain the nozzles during use. Wiping across sharp cut edges of the individual die modules within an array can damage the wiper blades. Accordingly, current designs for die module arrays are limited in order to avoid having a wiper structure traverse the sharp edges of the die modules within the array or alone.
- Current solutions to the problem include the provision of a monolithic front face to the printhead, systems of intermediate partial width arrays, adding a one-piece front face cap, and complex maintenance systems. However, all of these proposed solutions either negate the effectiveness of the silicon nozzles or add excessive cost to the final device.
- Thus, there is a need to overcome these and other problems of the prior art and to provide a method for forming an ink jet printhead subassembly and the resulting device, each of which provides a smooth and uniform silicon die array printhead surface for ease of maintenance. The smooth, coplanar printhead surface is maintainable without causing damage to known printhead wipers or other maintenance techniques.
- In accordance with the present teachings, a method of forming a subassembly for a full width array printhead is provided.
- The exemplary method can include providing a substrate, mounting an array of die modules on a surface of the substrate with an active face of each die module exposed, and supplying a curable fill material laterally contiguous with the array of die modules to define a continuous printhead surface coplanar with the active face of the array of die modules.
- In accordance with the present teachings, a subassembly for a full width array printhead is provided.
- The exemplary subassembly can include a substrate; an array of die modules formed on a surface of the substrate, each die module comprising an active fluid emitting surface; and a fill material surrounding the array of die modules and coplanar with the active surfaces.
- In accordance with the present teachings a printhead subassembly for an ink jet printer is provided.
- The exemplary subassembly can include at least one silicon die module laterally contiguous with a cured molding material, the silicon die module and cured molding material defining a continuous exposed surface.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
- The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate several embodiments of the invention and together with the description, serve to explain the principles of the invention
-
FIG. 1 depicts a perspective view of an exemplary ink jet printhead incorporating a completed subassembly in accordance with embodiments of the present teachings; -
FIG. 2 is a perspective view of a die module subassembly of a printhead subassembly in accordance with embodiments of the present teachings; -
FIG. 3 is a perspective view of a printhead subassembly at a further stage of assembly with respect toFIG. 2 and in accordance with embodiments of the present teachings; -
FIG. 4 is a side view illustrating an exemplary molding fixture in accordance with embodiments of the present teachings; and -
FIG. 5 is a flow chart depicting a method in accordance with exemplary embodiments of the present teachings. - Reference will now be made in detail to the exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. However, one of ordinary skill in the art would readily recognize that the same principles are equally applicable to, and can be implemented in devices other than ink jet printers, and that any such variations do not depart from the true spirit and scope of the present invention. Moreover, in the following detailed description, references are made to the accompanying figures, which illustrate specific embodiments. Electrical, mechanical, logical and structural changes may be made to the embodiments without departing from the spirit and scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense and the scope of the present invention is defined by the appended claims and their equivalents. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
- Embodiments pertain generally to ink jet printheads, and more particularly to the die module array subassembly thereof. Although the embodiments are described in connection with structures for “fluid”, it will be appreciated that the fluid can be ink, biologic fluid, industrial fluid, or chemical fluid, by way of non-limiting examples.
- A silicon member having a plurality of ink channels is known as a “die module” or “chip”. Each die module can comprise hundreds, thousands, or more of the fluid emitters, spaced 100, 180, 200 or 300 or more to the inch. An exemplary full-width thermal fluid jet fluid ejecting head has one or more die modules forming a full-width array extending across the full width of the receiving medium on which the image is to be printed. In fluid ejecting heads with multiple die modules, each die module can includes its own ink supply manifold, or multiple die modules can share a common ink supply manifold.
-
FIG. 1 illustrates a full widtharray type printhead 100 according to an exemplary embodiment herein. A full width array printhead will be understood herein to include an array of ejectors and extends the full width of a print sheet. Such a printhead can also encompass a large partial width array printhead. Theprinthead 100 can include thesubassembly 300 ofFIG. 3 , anink supply 110 connected to the subassembly, and awiper assembly 120 opposing an active surface of thesubassembly 300. - Passageways (not shown) can be provided to connect the
ink supply 110, such as a reservoir, to nozzle outlets (not shown) in the active fluid emitting surface of die modules in the printhead. The fluid emitting surface is known in the art to include a plurality of nozzle openings, which are omitted from the figures herein for purposes of simplification. Numbers and patterns of nozzle openings can vary widely and their detail does not form a part of the invention. - The
wiper assembly 120 can be used to clear debris from the active fluid emitting surface of thesubassembly 300. Thewiper assembly 120 can include flexible rubber or polymer blades, and the specific structure thereof can vary according to design parameters. - As depicted in
FIG. 2 , adie module subassembly 200 can include asubstrate 210 and an array ofdie modules 220 mounted on thesubstrate 210. Each of thedie modules 220 can include a mounting surface (not shown) and the fluid emitting or “active”surface 225. The mounting surface is that which is fixed to thesubstrate 210, while theactive surface 225 includes the fluid dispensing surface. Mounting of theindividual die modules 220 within the array can be by any known means including, but not limited to, adhesive, welding, encapsulation, and the like. In addition, while the array pattern is depicted as staggered, any suitable pattern can be used, including overlapping of the individual modules as is known in the art. It will be appreciated, as described above, that theactive surface 225 can include a plurality of nozzle outlets formed in various shapes and patterns therein. - The
substrate 210 can be a simple circuit board material such as a high Tg FR4 ranging up to a Low Temperature Co-fired Ceramic (LTCC) substrate. - Referring now to
FIG. 3 ,printhead subassembly 300 can include ahardenable material 350 supplied to surround the plurality of diemodules 320 mounted on thesubstrate 310. Thehardenable material 350 can be supplied to a height coplanar with theactive surface 325 of the array ofdie modules 320. - As depicted, the
hardenable material 350 can initially be of a sufficient fluidity to create a seamless and coplanar upper surface with thedie modules 320. Such a smooth planar upper surface of thesubassembly 300 is free of sharp edges which could otherwise affect maintenance of the surface, particularly maintenance with wiper assemblies. An example of the type of wiper assembly suitable for use in the present invention is that described in U.S. Pat. No. 5,432,539, incorporated herein by reference in its entirety. - While a
hardenable material 350 is described, it will be appreciated that the hardenable material can include a curable material suitable for the exemplary purpose. -
FIG. 4 . is a schematic cross sectional view of a portion of anexemplary device 400 for supplying thecurable material 450 to form theprinthead subassembly 300 ofFIG. 3 . In particular, the exemplary device can include amolding component 460 shaped to include anengaging surface 465 and dependinglegs 470 surrounding thesubstrate 410. The diemodule engaging surface 465 can be planar in order to avoid gaps between theactive surface 425 of thedie module 420 and theengaging surface 465 of themolding component 460. - In addition, a
sealing layer 480 can be positioned between theactive surface 425 of thedie module 420 and theengaging surface 465 of themolding component 460. Thesealing layer 480 can be a material initially applied to theactive surface 425 of thedie module 420 or to theengaging surface 465 of themolding component 460, or both. - An injection member 490, such as an injection needle, can pass through one or
more ports 492 of thesubstrate 410. The injection member 490 can be positioned to injectmolding material 450 under pressure into acavity 455 or interstices defined by the remaining space surrounding thedie modules 420 and between the planarengaging surface 465 and the planarupper surface 415 of thesubstrate 410.Excess molding material 450 can be evacuated from theinterstices 455 bysuitable exhaust ports 495. In addition, other excess material can be trimmed away after the molding process. - It will be appreciated that while the
molding device 400 is illustrated in an exemplary embodiment for providing themolding material 450 as described, it is understood that a suitable molding material could be found which does not require used of the molding component. In either instance the result can be a uniform, smooth surface that is easy to maintain in a printer environment. - A
method 500 for forming thesubassembly 300 ofFIG. 3 and using the device ofFIG. 4 can include those steps described inFIG. 5 . It will be appreciated that while certain steps are shown, other steps may be added or existing steps can be removed or modified without departing from the scope of the invention. - Continuing, forming of the
subassembly 300 can include supplying asubstrate 310 at (step 510). A plurality ofdie modules 320 can be mounted to thesubstrate 310 at step 520. Thedie modules 320 can be positioned or staggered in an array suitable for any full width printing array. - An
optional step 530 can be included for applying asacrificial film 480 to one or both of thedie modules 420 and theengaging surface 465 of themolding component 460. Use of thesacrificial film 480 can enhance protection of the parts during molding and final processing. - At 540, the
molding component 460 is positioned such that theengaging surface 465 thereof is in continuous surface contact with theactive surfaces 425 of all of themodule components 420. Atstep 550, thecurable molding material 450 is injected into theopen regions 455 surrounding thedie modules 420 and between the planarupper surface 415 of thesubstrate 410 and planarengaging surface 465 of themolding component 460. - At 560, the
molding material 450 can be cured in situ prior to removal of themolding component 460 from the subassembly at 570. As an alternative, the molding material can be cured at 580 subsequent to removal of the molding component from the subassembly at 570. In addition, it is appreciated that certain materials can be partially cured at 560 prior to removal of themolding component 460 after which a final cure can take place at 580. If the subassembly is removed from themolding component 460 for curing, it can be cured in batches along with similar subassemblies. - Subsequent to a curing, any
excess molding material 450 can be trimmed from the subassembly atstep 590 as desired. - The
molding material 450 can be an encapsulant, such as an underfill encapsulant. In addition, a variety of known molding materials suitable for use in the exemplary embodiments include those which are epoxy based and rapidly cured to enable efficient duration of manufacturing cycles. Compound formulations can vary and are driven by enormous worldwide volume and are responsive to environmental concerns. In any event, the molding material can be selected to complement the coefficient of thermal expansion (CTE) of the substrate used. The molding material used can be of a composition, such as glass filled epoxies, which will not shrink or separate from the silicon material of the die modules, and have a similar CTE as the die modules. Non-limiting examples include those materials available in the 3-20 ppm/degree C. range, which are also compatible with substrate and wirebond materials. This value can be adjusted by altering the filler silica content as known in the art. - As an exemplary alternative, the molding material can be a low viscosity material. The low viscosity material can be poured or otherwise supplied to the
molding component 460 such that the molding material flows to surround into the desired fill volume. Subsequent curing of the low viscosity molding material will render a suitable hardness to the fill material and provide the same results as injection molded material. - Although the relationships of components are described in general terms, it will be appreciated by one of skill in the art can add, remove, or modify certain components without departing from the scope of the exemplary embodiments.
- It will be appreciated by those of skill in the art that several benefits are achieved by the exemplary embodiments described herein and include the use of low cost materials such as polymer molding compounds that are resistant to a wide variety of chemicals and ink. The compounds selected can be used in a high temperature environment, typically up to about 125° C. The method and structure still allow for the formation of integrated fluid and electrical interconnects. Further, the subassembly can be marked with indelible (such as by laser) part numbers and date codes for identification purposes.
- While the invention has been illustrated with respect to one or more exemplary embodiments, alterations and/or modifications can be made to the illustrated examples without departing from the spirit and scope of the appended claims. In particular, although the method has been described by examples, the steps of the method may be performed in a difference order than illustrated or simultaneously. In addition, while a particular feature of the invention may have been disclosed with respect to only one of several embodiments, such feature may be combined with one or more other features of the other embodiments as may be desired and advantageous for any given or particular function. Furthermore, to the extent that the terms “including”, “includes”, “having”, “has”, “with”, or variants thereof are used in either the detailed description and the claims, such terms are intended to be inclusive in a manner similar to the term “comprising.” And as used herein, the term “one or more of” with respect to a listing of items such as, for example, “one or more of A and B,” means A alone, B alone, or A and B.
- Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements. Moreover, all ranges disclosed herein are to be understood to encompass any and all sub-ranges subsumed therein. For example, a range of “less than 10” can include any an all sub-ranges between (and including) the minimum value of zero and the maximum value of 10, that is, any and all sub-ranges having a minimum value of equal to or greater than zero and a maximum value of equal to or less than 10, e.g., 1 to 5.
- Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims and their equivalents.
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/536,196 US8132892B2 (en) | 2007-08-13 | 2009-08-05 | Maintainable coplanar front face for silicon die array printhead |
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Application Number | Priority Date | Filing Date | Title |
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US11/837,728 US7591535B2 (en) | 2007-08-13 | 2007-08-13 | Maintainable coplanar front face for silicon die array printhead |
US12/536,196 US8132892B2 (en) | 2007-08-13 | 2009-08-05 | Maintainable coplanar front face for silicon die array printhead |
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US11/837,728 Division US7591535B2 (en) | 2007-08-13 | 2007-08-13 | Maintainable coplanar front face for silicon die array printhead |
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US20090289994A1 true US20090289994A1 (en) | 2009-11-26 |
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US12/536,196 Expired - Fee Related US8132892B2 (en) | 2007-08-13 | 2009-08-05 | Maintainable coplanar front face for silicon die array printhead |
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Also Published As
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US20090046125A1 (en) | 2009-02-19 |
US7591535B2 (en) | 2009-09-22 |
US8132892B2 (en) | 2012-03-13 |
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